2121200119991 has 2 divisors, whose sum is σ = 2121200119992. Its totient is φ = 2121200119990.

The previous prime is 2121200119981. The next prime is 2121200120029. The reversal of 2121200119991 is 1999110021212.

It is an a-pointer prime, because the next prime (2121200120029) can be obtained adding 2121200119991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121200119991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121200119981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600059995 + 1060600059996.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600059996).

Almost surely, 2^{2121200119991} is an apocalyptic number.

2121200119991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121200119991 is an equidigital number, since it uses as much as digits as its factorization.

2121200119991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 2121200119991 in words is "two trillion, one hundred twenty-one billion, two hundred million, one hundred nineteen thousand, nine hundred ninety-one".